TheAmerican Horror Storyshowrunner got Joan Collins to join the series with nothing but an informal chat on the dance floor at an Oscars after-party, according to Sarah Paulson.

"We were at the Vanity Fair Oscar party, and we turned around, and I was like, 'Oh my god, there's Joan Collins,'" Paulson told ET's Sophie Schillaci at AHS: Cult's For Your Consideration event at the WGA Theater in Los Angeles on Friday. "He grabbed me by the hand and off we went."

"The deal was made on that floor," she she shared. "It's amazing."

During Friday's panel, Murphy opened up more about Collins' casting in the next installment of AHS, revealing that she'll play the grandmother of Evan Peters' character, who is a "comedic" hairstylist. Paulson, Billy Eichner, Leslie Grossman, Cheyenne Jackson and Kathy Bates will return to round out the cast of the season, which Murphy said will take place in October 2019.

Details of Paulson's character are still under wraps, but the actress told ET it's going to be hard to top her favorite AHS character, Lana Winters, despite the "mind F" that was AHS: Cult.

"I try not to take that kind of stuff home," she said.

"It's a nice way to go to work and exercise all your demons, and then go home and have a glass of wine not laced with arsenic," Paulson joked. "As one does."

"I would like to visit Cordelia again, because she didn't really come into her own until the last few episodes, and I would love to see what would happen to someone who was basically so pure and decent and kind when she became the most powerful of them all, and what would that do, and would she be corrupted," she added of her AHS: Coven character. "You know, she is her mother's daughter, and her mother was a corruptible creature. So, I'm sort of interested to see, that would be interesting to me."

As for whether Murphy would ever bring back Coven for round two, Paulson's not as sure. "I think he's mentioned an idea about having a crossover season at some point. I have no idea if that's still in the cards," she expressed. "You know, Ryan gets these fever dreams and these blasts of energies and ideas, and sometimes they become the show and sometimes they become something else."